Carpentry/engineering help

Junkyard Dog

Well-Known Member
Joined
Mar 21, 2005
Location
Sanford, NC
Going to be starting a new project here in next week or two and wanted some experienced opinions if available. I am needing to attach some trusses to I-beam. Basically using the ibeam as my header. Most folks say to drill holes in the beam flange and bolt or lag a 2x to the beam and them attach trusses as they normally would be. But I am leaning toward welding some tabs perpendicular to the flange with a hole pattern and just shooting screws thru the plate into the trusses. I can do all the Fab work on the ground and the trusses should go up quickly. But the question is what size screws and how many are sufficient? Anyone have any experience with this?
 
Get an appropriate Simpson truss clip.
Attach it to truss as Simpson requires.
Anchor truss clip to I beam with appropriate Ramset pins for structural steel.

If you feel you need to set the trusses on wood, Ramset some dimensional lumber to the top of the beam and then attach the truss clip to truss and wood on the beam as usual.

Oh, and if you use screws, the inspector will fail you. Use truss nails. ;)
 
I have a 30 year old building done just like this, funny I was just looking to see how they tied the wood trusses to the I beams for the first time like an hour ago. Anyway they welded a 3" piece of angle with a hole on one leg that gets a single 1/2" bolt through each truss. Pretty simple and clearly works.
 
Isn't going to be inspected, should have mentioned that. It's just an open shelter, maybe with the back closed in. I could use nails if they are better but figured screws would be.
 
My carport is boxed I beams with rafters on top. My engineered plans said to drill a 1/4" hole every 2' so they could lay a 2x6 on it to nail the rafters to. They screwed through the holes into the 2x6 to fasten them together.
 
My idea was to weld angle iron on for every rafter like you said but their way wound up being a lot easier.
 
awheelterd said:
My carport is boxed I beams with rafters on top. My engineered plans said to drill a 1/4" hole every 2' so they could lay a 2x6 on it to nail the rafters to. They screwed through the holes into the 2x6 to fasten them together.
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I couldn’t imagine 1, 1/4” screw every 2’ would be enough to hold down all the rafters. I mean, top plates have a lot more nails than that and rafter clips have a lot of nails, usually 4-6 per rafter. At a 2’ spacing, even with 4-6 nails on the clip holding it to the 2x6, the 2x6 only has 1 screw holding it at that 2’ spacing. Seems it wouldn’t be the best for preventing wind uplift in storms. But, I’m no engineer, so I could be totally off my rocker.
 
rockcity said:
I couldn’t imagine 1, 1/4” screw every 2’ would be enough to hold down all the rafters. I mean, top plates have a lot more nails than that and rafter clips have a lot of nails, usually 4-6 per rafter. At a 2’ spacing, even with 4-6 nails on the clip holding it to the 2x6, the 2x6 only has 1 screw holding it at that 2’ spacing. Seems it wouldn’t be the best for preventing wind uplift in storms. But, I’m no engineer, so I could be totally off my rocker.
Click to expand...

Now that I think of it there were 2 screws every foot. There was one on each side of the I beam web. They weren't regular decking screws either. Maybe timberloc?
 
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